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What is Testosterone undecanoate?

Testosterone undecanoate is authorized for testosterone replacement therapy of primary and secondary male hypogonadism, i.e., if testosterone deficiency has been confirmed both by clinical and by laboratory tests. Testosterone undecanoate is licensed in more than 80 countries worldwide.

Chemical Name: Testosteron...

What is Testosterone undecanoate?

Testosterone undecanoate is authorized for testosterone replacement therapy of primary and secondary male hypogonadism, i.e., if testosterone deficiency has been confirmed both by clinical and by laboratory tests. Testosterone undecanoate is licensed in more than 80 countries worldwide.

As stability tests have shown that Testosterone undecanoate is stable at a temperature of 30°C for at least 24 months and at a temperature of 40°C for at least 6 months, there are no particular precau-tions for storing the product. It is recommended to store the product at room temperature. Shelf life is 5 years in most countries. The medicinal product must be used immediately after first opening.

Dosage:

Testosterone undecanoate is injected in intervals of 10-14 days. It is advisable to reduce the first interval to six days in order to reduce the time until steady state conditions are reached. (During the initial time of treatment the mean concentration of testosterone is slowly increasing with each injection. Steady state is reached when the amount of testosterone supplied with an injection replaces exactly what has been metabolized from the intramuscular depot). Individualization of therapy is required and should be based on serum testosterone levels achieved under Testosterone undecanoate treatment and clinical symptomatology.

Drug mechanism:

Testosterone undecanoate provides testosterone to men whose testes do not produce enough testosterone. The injection is an intramuscularly administered depot preparation of Testosterone undecanoate. Following intramuscular injection of Testosterone undecanoate as an oily solution, the com-pound is gradually released from the depot and immediately cleaved by serum esterases into testosterone and undecanoic acid. An increase in serum levels of testosterone above basal values may be seen immediately after administration. The muscle serves as a depot for the sustained release of testosterone into the systemic circulation.

Circulating testosterone is chiefly bound in the serum to sex hormone-binding globulin (SHBG) and albumin. The albumin-bound fraction of testosterone easily dissociates from albumin and is presumed to be bioactive. The portion of testosterone bound to SHBG is not considered biologically active. The amount of SHBG in the serum and the total testosterone level will determine the ratio of bioactive and non-bioactive androgen. SHBG-binding capacity is high in prepubertal children, declines during puberty and adulthood, and increases again during the later decades of life. Approximately 60 % of testosterone in plasma is bound to SHBG, 2 % remains unbound (free) and the rest is bound to albumin and other proteins.